I'm using the File Upload operation in IoT Hub to send aggregated telemetry from our devices to blob storage. Our devices sometimes lose power and aren't able to invoke a cancelation token or send a 400 error code to IoT Hub before shutting down. Then they start back up and don't know how many of the 10 upload tokens are available.
Is there a property I can poll to see how many tokens are active at a certain time for a device?
Thanks

